Mascara brush



FIG. 1 is a top, right side perspective view of a mascara brush showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM The ornamental design for a mascara brush, as shown and described. 